Consider statements about scientists: 1. Antonie van Leeuwenhoek discovered bacteria. 2. Robert Koch established postulates for disease causation. 3. Alexander Fleming discovered the antibiotic streptomycin. Which are correct? MCQ with Answer and Explanation

Explanation:
Bombyx mori is the domesticated silkworm, whose caterpillar spins a silk cocoon. The silk thread is obtained by boiling cocoons. Apis mellifera is the honeybee, Labeo rohita is a fish (rohu), Drosophila is fruit fly used in genetics. Sericulture involves mulberry cultivation, silkworm rearing, and reeling of silk. India is the second largest silk producer.

Explanation:
Kidneys filter blood (1) and produce erythropoietin (3). Glucose reabsorption occurs in the proximal tubule, not collecting duct. So 2 is incorrect.

Explanation:
Glomerular filtration rate (GFR) is the volume of filtrate formed per minute by both kidneys, normally about 125 mL/min (180 L/day). Nearly 99% of the filtrate is reabsorbed, leaving about 1-2 liters of urine per day. GFR is regulated by the juxtaglomerular apparatus. It's an important clinical indicator of kidney function, estimated from serum creatinine.